s3-toolbox-mcp-server
An MCP server (STDIO transport) that exposes AWS S3 operations to an AI agent via Model Context Protocol tools: list buckets, list objects, upload (Base64 content), download, get object metadata, and delete objects. It uses Spring Boot/Spring AI MCP and AWS SDK v2; AWS credentials are provided to the process via environment variables.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Security depends on AWS IAM policy assigned to the provided credentials. The README shows long-lived access keys via environment variables but does not discuss secret handling beyond that, nor does it describe key logging avoidance, bucket/key allowlists, or confirmation workflows for destructive operations. TLS is not directly applicable to STDIO transport, but AWS calls inherently use HTTPS by the AWS SDK; explicit enforcement/assurance is not documented. No scoped authorization model for MCP tools is described beyond the AWS credentials themselves.
⚡ Reliability
Best When
You want local/desktop integration with an MCP-compatible client/IDE and can provision least-privilege AWS credentials for the server process.
Avoid When
You cannot control/validate which buckets/keys the agent can access, or you need documented quotas/retry/idempotency behavior for safe automation.
Use Cases
- • Agent-assisted S3 exploration (browse buckets/keys by prefix)
- • Automating uploads/downloads based on natural-language requests
- • Retrieving S3 object metadata for workflows
- • Deleting objects as part of cleanup or lifecycle tasks
Not For
- • Highly sensitive or compliance-constrained environments without additional guardrails/least-privilege design
- • Use cases requiring strict auditability, approvals, or human-in-the-loop controls (not described)
- • Public-facing deployments (runs as a local MCP process via STDIO; no network hardening described)
Interface
Authentication
No OAuth/scoped token mechanism is described for the MCP server itself; authorization is delegated to the AWS credentials used by the process. Least-privilege IAM policy design is critical but not documented here.
Pricing
Pricing for the server itself is not described; AWS usage costs apply for S3 operations.
Agent Metadata
Known Gotchas
- ⚠ Agent may request operations on unintended buckets/keys; no allowlist/guardrails are described
- ⚠ Uploads require base64 content; large files may hit size/time limits (not documented)
- ⚠ Deletion is destructive; no confirmation/soft-delete policy described
- ⚠ No documented pagination/max-results behavior for list operations (could be partial results or truncation)
Alternatives
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Scores are editorial opinions as of 2026-04-04.